How do galaxies grow?

Composite colour-image of the brightest galaxies in four groups located about 4 billion light-years away. The galaxies are ordered in increasing stellar mass, i.e. a rough time sequence. The brightest galaxies in group 1 and 2 both have obvious bright, gravitationally bound companions. Further images obtained with the Hubble Space Telescope shows that the brightest galaxy in group 3 has a double nucleus. Thus, these galaxies are currently in the process of merging. This discovery provides unique and powerful validation of hierarchical formation as manifested in both galaxy and cluster assembly.

Kilde:

ESO

Om bildet

ID:eso0824a
Type:Kollasj
Publiseringsdato:26. august 2008
Relaterte pressemeldinger:eso0824
Størrelse:1646 x 408 px

Om objektet

Navn:Galaxies
Type:Early Universe : Galaxy : Type : Interacting
Kategori:Galaxies

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